jQuery マウスの座標軸の取得

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マウスの座標軸を$(‘#container’).mousemove(function(e){　console.log(e.clientX, e.clientY);　で取得し、中心からの距離に合わせてオブジェクトの形状を変える処理です。

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<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <title>パララックスサイト</title>
    <style>
    body {
      margin: 0;
      padding: 0;
    }
    #container {
      width: 600px;
      height: 280px;
      background: #eee;
    }
    .box {
      position: fixed;
      opacity: 0.6;
      left: 300px;
    }
    #box1 {
      width: 40px;
      height: 40px;
      top: 140px;
      background: red;
    }
    #box2 {
      width: 50px;
      height: 50px;
      top: 155px;
      background: blue;
    }
    #box3 {
      width: 60px;
      height: 60px;
      top: 165px;
      background: yellow;
    }
    </style>
    <link rel="stylesheet" href="styles.css">
  </head>
  <body>
    <div id="container">
    <div id="box1" class="box"></div>
    <div id="box2" class="box"></div>
    <div id="box3" class="box"></div>
    </div>
    <script>
    $(function(){
      $('#container').mousemove(function(e){
          console.log(e.clientX, e.clientY);
          var cx = $(this).width() / 2;
          var cy = $(this).height() / 2;
          var dx = e.clientX - cx;
          var dy = e.clientY - cy;
          $('#box1').css('left', cx + dx * 1.1);  
          $('#box2').css('left', cx + dx * 1.3);
          $('#box3').css('left', cx + dx * 1.5);
          $('#box1').css('top', cy + dy * 1.0);  
          $('#box2').css('top', cy + dy * 1.1);
          $('#box3').css('top', cy + dy * 1.2);       
      });
    });
    </script>
  </body>
</html>